class ELFFile: EI_NIDENT = 16 EI_CLASS = 4 EI_DATA = 5 EI_VERSION = 6 EI_OSABI = 7 EI_ABIVERSION = 8 # possible values for EI_CLASS ELFCLASSNONE = 0 ELFCLASS32 = 1 ELFCLASS64 = 2 # possible value for EI_VERSION EV_CURRENT = 1 # possible values for EI_DATA ELFDATANONE = 0 ELFDATA2LSB = 1 ELFDATA2MSB = 2 def my_assert(self, expectation, result): if not expectation == result: #print "'%x','%x' %s" % (ord(expectation), ord(result), self.name) raise Exception("This does not work as expected") def __init__(self, name, bits = 0): self.name = name self.bits = bits def open(self): self.file = file(self.name, "r") self.data = self.file.read(ELFFile.EI_NIDENT+4) self.my_assert(len(self.data), ELFFile.EI_NIDENT+4) self.my_assert(self.data[0], chr(0x7f) ) self.my_assert(self.data[1], 'E') self.my_assert(self.data[2], 'L') self.my_assert(self.data[3], 'F') if self.bits == 0: if self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS32): self.bits == 32 elif self.data[ELFFile.EI_CLASS] == chr(ELFFile.ELFCLASS64): self.bits == 64 else: # Not 32-bit or 64.. lets assert raise Exception("ELF but not 32 or 64 bit.") elif self.bits == 32: self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS32)) elif self.bits == 64: self.my_assert(self.data[ELFFile.EI_CLASS], chr(ELFFile.ELFCLASS64)) else: raise Exception("Must specify unknown, 32 or 64 bit size.") self.my_assert(self.data[ELFFile.EI_VERSION], chr(ELFFile.EV_CURRENT) ) self.sex = self.data[ELFFile.EI_DATA] if self.sex == chr(ELFFile.ELFDATANONE): raise Exception("self.sex == ELFDATANONE") elif self.sex == chr(ELFFile.ELFDATA2LSB): self.sex = "<" elif self.sex == chr(ELFFile.ELFDATA2MSB): self.sex = ">" else: raise Exception("Unknown self.sex") def osAbi(self): return ord(self.data[ELFFile.EI_OSABI]) def abiVersion(self): return ord(self.data[ELFFile.EI_ABIVERSION]) def abiSize(self): return self.bits def isLittleEndian(self): return self.sex == "<" def isBigEngian(self): return self.sex == ">" def machine(self): """ We know the sex stored in self.sex and we know the position """ import struct (a,) = struct.unpack(self.sex+"H", self.data[18:20]) return a